[Bluetooth] Add platform device for virtual and serial devices

This patch adds a generic Bluetooth platform device that can be used
as parent device by virtual and serial devices.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/drivers/bluetooth/btuart_cs.c b/drivers/bluetooth/btuart_cs.c
index c889bf8..746ccca 100644
--- a/drivers/bluetooth/btuart_cs.c
+++ b/drivers/bluetooth/btuart_cs.c
@@ -502,6 +502,7 @@
 
 	hdev->type = HCI_PCCARD;
 	hdev->driver_data = info;
+	SET_HCIDEV_DEV(hdev, &info->p_dev->dev);
 
 	hdev->open     = btuart_hci_open;
 	hdev->close    = btuart_hci_close;